MAP - Revised Check Chart for DTC's 33, 34, 63, 64

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Number: 90-199-6E

Section: 6E

Date: March 1990

Corporate Bulletin No.: 016510


Subject: REVISED CHART C-1D, CODE 33, 34, 63, 64


Model and Year: 1980-90 PASSENGER CARS AND TRUCKS


TO: ALL CHEVROLET DEALERS

This bulletin revises the Manifold Absolute Pressure (MAP) Output Check Chart C-1D and updates Code 33, Code 34, Code 63, and Code 64 in the Service Manual section on "Driveability And Emissions" (Section 6E1, 6E2, and 6E3). This information applies to all MAP Sensors on 1980-1990 vehicles with gasoline engines (except turbocharged) with green (standard) MAP sensor electrical connector insert or the solid black MAP sensor electrical connector insert.

The revised chart information:








- Diagnostic Chart C-1D.


The updated chart information:








- Diagnostic Chart Code 33.








- Diagnostic Chart Code 34.








- Diagnostic Chart Code 63.








- Diagnostic Chart Code 64.